Fire-alarm apparatus



S. NIKIEL.

FIRE ALARM APPARATUS.

APPLICATION HLVED SEPT. 18. 1919.

1,38 49. I PatentedAug. 9,1921.

INVENTOR.

Sfefqn NM'iel A TTORNE Y.

PATENT, oFFIcE.

- STEFAN FN W. YORK, N. Y.

FIRE-ALARM nrmnnrus.

Specification of Letters Patent.

Patented Aug. 9, 1921.

Application filed September 18, 1919. Serial No. 324,515.

To all whom it may concern:

Be it known that I, STEFAN NIKInL, a citizen of Poland, residing at NewYork, county of New York, and State of New York, have invented certainnew and useful Improvements in Fire-Alarm Apparatus, of which thefollowing is 'a specification.

This invention relates to a fire alarm signal, designed to be installedat any point 1n a building or other lace where there is dan er fromoverheating or a possible fire.

The object of this invention is to provide a means of signaling from onepoint to another through the medium of a wall circuit box, having directwire connections with a more or less distant signal bell, electricallyconnected with a low voltage battery of ordinary design.

These objects are attained b the novel construction and combination 0parts hereinafter described and shown in the accompan ing drawings,forming a material part of t is disclosure, and in which- Figure 1 is afront plan view of a perforated metal switch box cover.

c Fig. 2 is a transverse sectional view of the same, taken on line 2-2of Fig. 1, showing the cover assembled with the box, with the interiormechanism in place. Fig. 3 is a plan view of the switch box interiorwith the cover removed, and,

Fi 4 is a side elevational view showing the signal box and connectionsto the battery and signal bell.

Referring to the drawings in detail, the numeral 5 designates an annularbox cover pierced to present oppositely extending openings 6, itsflanged portions .7 being slotted on its peri heral surface to providespring tension. disk .9 of low fusing metal is'pierced at the center byan elongated slot 10, its edge being clamped by the flange 7.

A contact arm 12, having a fin er 12 engageable in the slot 10, is movaby pivoted within a slotted stud 13, and insulated from the annular boxbody 14 by the insulation washer 15, and held by the binding nut 16threaded on the stem of the stud 13. A contact button 17 looselyattached to the arm 12, is contactable with the fixed contact button 18,insulated in a proper manner from box body 14, by insulating washers 19,held rigidly by means of a binding nut 20, threaded on the stem of thecontact button 18. I

A light coiled tension spring 22, is attached at one end to an upturnedpierced projection 24, the spring being secured at its opposite end to aprojection 25 provided for this purpose on. the arm 12.

The metal box or casing body 14, has formed in its periphery an annularrecess 26, for the reception of the cover beading 27 and is attachableto the wall by means of screws entered through holes 23 formed in thebottom of the box 14.

A battery 28 and an electric bell 29 suitably connected by the insulatedwires 30, 31 and 32, is connected, by means of binding nuts 33 and 34,to the threaded stem of the post 13 and contact button 18.

In operation, the metal box or casing 14, containing the centralinsulated contact button 18 and the contact arm 12 is secured inposition. Between the casing 14 and cover 5 is interposed the fusibledisk 9, having the slot 10 into which the free end of the contact arm 12is inserted and retained, thereby producing a definite separation ofcontacts 17 and 18.

Attached under the binding nuts 33 and 34 are insulated wires 31 and 32,making connection with one pole of the battery and one binding post ofthe signal bell, while another insulated wire 30, completes theconnection between the battery and the bell.

Should the temperature surrounding the signal box exceed the fusingpoint of the disk 9, the contact arm 12, carrying contact 17, is drawninto contact with the button 18, by the spring 22, thereby closing theelectrical circuit and ringing the signal bell 29.

From the foregoing it will be obvious that one or more of the alarmsignal boxes may be arranged in the same circuit, at different points inthe building, and should the temperature rise above the fusing point ofthe disk or diaphragm, an alarm will be given by the bell wherever itmay be located, thus affording an efiicient and practical safety devicein case of fire.

Having thus described my invention what I claim as new and desire tosecure by Letto be normally engaged by the end of said ters Patent,isarm, and a spring adapted to drawboth con- 10 In a circuit closer ofthe character detacts into engagement upon the fusing of scribed, incombination, a metal casing, a said disk, disengaging said arm therefrom5 central contact button in said casing insufor closing a signalcircuit.

lated therefrom, a contact arm, a contact In testimony whereof I haveafiixed my on said arm a disk of 10W fusing metal'in signature.

said casing having a central slot and adapted STEFAN NIKIEL.

